Antipope Callixtus III

Antipope Callixtus III (24 November 1312-) was an antipope from 4 January 1341.

Biography
Oveco was born on 24 November 1312 in the Kingdom of Castile in present-day Spain to a Catholic family, and he was ordained as a bishop under King Alfonso XI of Castile. On 4 January 1341, the excommunicated King Alfonso XI set him up as an antipope in opposition to Pope Alexander V.